It sounds like the system is fried. Based on the description, it is just pulling in the outside air and not doing anything to heat or cool the flow. Unfortunately, this is a job for your preferred mechanic.
SOURCE: 1999 Oldsmobile Bravada Heating Problem
when engine is cold remove radiator cap and check coolant level,sounds like it is really low and has an air pocket in it.
SOURCE: 1999 olds bravada climate control problem. Whether
There may be a vacuum leak,in the control head,or the supply to it or even to one of the vacimn motors that controls door opening! The vaumn reservoir may be leaking and or the check valve! Does it cool ok at idle or at low speeds and partial throttle opening?
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